Power comes from a TwinPower Turbo 3.0-liter inline six-cylinder engine (N55) that has been tuned to produce 320 hp (239 kW / 324 PS) and 317 lb-ft (429 Nm) of torque - an increase of 20 hp (15 kW / 20 PS) and 17 lb-ft (23 Nm). It can be paired to a six-speed manual or an optional seven-speed Double Clutch Transmission (DCT).

Besides the modest bump in output, the 135is features a new differential with an electronic rear brake management system that acts like a differential lock. There's also a revised stability control system with a Dynamic Traction Control function that "provides electronic intervention to prevent loss of vehicle control, but at a higher threshold before activation."

The 2013 BMW 135is coupe and convertible will begin arriving at U.S. dealerships this fall and pricing starts at $44,145 and $48,845 respectively (including an $895 destination and handling charge).